[Beowulf] Re: Beowulf of bare motherboards

Mark Hahn hahn at physics.mcmaster.ca
Sat Oct 23 16:49:36 EDT 2004


> testing.  In all cases, I plugged the supply into my Kill-a-Watt,
> attached 3 of the above y-cables to the supply, and simply varied the
> number of motherboards plugged into those 4 connectors.

very interesting, but somewhat hard to interpret.  I love my killawatt,
too, but unfortunately for this experiment, you need to know how much
current the nodes were drawing on each voltage (and the PS specs.)

for instance, the TT PS might actually provide 420, but only enough
on 3.3 to support a single CPU's VRM, but *lots* of 12V umph.
that wouldn't be unreasonable, given the market for "normal" uses - 
big PS's support machines with lots of disks, or possibly systems
that use extra 12V for hot AGP cards, etc.

on the other hand, Sparkle is the only one of these PS vendors
that I see in OEM settings - TT/MGE/Enermax all seem to be mostly
after-market vendors.  interpret that how you will ;)

regards, mark hahn.

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